Polymerization reactor and method for producing water absorbent resin

Abstract

A polymerization reactor of the present invention includes a container body 1 and a jacket 2 covering the outer surface of the container body 1 and defining a passage for passing a cooling / heating medium between itself and the outer surface of the container body. The container body 1 is made of a clad metal plate including a support metal layer 11a having an inner surface at an inner side of the container body and an outer surface at an outer side of the container body, and an inner corrosion-resistant metal skin layer 11b bonded to the inner surface of the support metal layer and being smaller in thickness than the support metal layer.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a polymerization reactor for performing polymerization reaction. In particular, the present invention relates to a polymerization reactor configured to allow heat transfer through a wall of a container body due to the flow of a cooling / heating medium. The invention also relates to a method for producing a water absorbent resin by using such a polymerization reactor.BACKGROUND ART[0002]FIG. 4 shows a typical polymerization reactor used for producing a polymer such as a water absorbent resin. The illustrated polymerization reactor has a container body 91 for containing e.g. a reaction solution, and an outer shell (jacket 92) that covers the outer surface of the container body 91. A cooling / heating medium (cooling medium or heating medium) is caused to flow through the inside of the jacket92 as required, so that the content (e.g. reaction solution or reaction mixture) is cooled or heated due to heat transfer through the wall ...

AI Technical Summary

Benefits of technology

[0012]The present invention is conceived under the circumstances described above. It is therefore an object of the present invention to provide a polymerization reactor capable of shortening the heat transfer time during the polymerization process while maintaining reliability for long use. The present invention also relates to a method for efficiently producing a water absorbent resin using such a polymerization reactor.

Problems solved by technology

Such a large thickness leads to a decrease in the efficiency of heat transfer through the wall of the container body and hence leads to an increase in the heat transfer time, hindering the improvement of productivity.

However, it is difficult to check the condition inside the container body during the use of the polymerization reactor.

Thus, in view of possible breakage or the like of the wall due to deterioration with time, reducing the wall thickness of the passage for a cooling / heating medium provided on the inner side of the container body and bonding the wall by welding causes poor reliability for long use.

However, stainless steel is inferior to carbon steel in heat transfer ability.

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